16-4
MSM66591/ML66592 User's Manual
Chapter 16 A/D Converter Functions
16.1 Configuration of A/D Converter
Since the basic configurations of the A/D converter 0 and the A/D converter 1 are the
same, this section chiefly explains the configuration of A/D converter 0.
The A/D converter has three operation modes: scan mode, select mode, and hard
select mode.
[1]
Scan Mode
In scan mode, A/D conversion is sequentially performed from any channel out of ch0–
ch11 to ch11 (from any of ch12–ch23 to ch23 for A/D converter 1). The scan mode is
mainly controlled by the A/D control register L (ADCON0L, ADCON1L). In scan mode,
the scan mode provides the selection whether to stop A/D conversion at the end of A/D
conversion for ch11 (ch23 for A/D converter 1) or to restart A/D conversion automati-
cally from the first channel specified.
[2]
Select Mode
In select mode, any channel of ch0–ch11 (any of ch12–ch23 for A/D converter 1) is
specified, and A/D conversion is performed for the specified channel. The select mode
is mainly controlled by the A/D control register H (ADCON0H, ADCON1H).
It is also possible to operate select mode during scan mode operation. In this case, A/D
conversion for a channel that A/D conversion is progressing for in scan mode, is
suspended at that point when select mode is specified, and A/D conversion for the
channel specified in select mode is performed. When A/D conversion in select mode
ends, A/D conversion in scan mode restarts from the suspended channel.
ch0
ch1
ch2
ch2
ch3
ch4
q
w
A/D conversion in scan mode
A/D conversion in select mode
q
A/D conversion for ch2 is suspended.
A/D conversion for ch4 in select mode starts.
A/D conversion for ch4 ends.
A/D conversion from ch2 in scan mode restarts.
w
Figure 16-3 Timing Diagram During Select Mode Operation in Scan Mode
[3]
Hard Select Mode
The hard select mode specifies a channel from ch0 to ch3 (from ch12 to ch15 for A/D
converter 1) and performs A/D conversion of the channel when an interrupt request is
generated.
Содержание MSM66591
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